21.   In the market for browser software, Microsoft is sparing no effort to catch up to the leader, Netscape Communications Corp. of Mountain View, Calif.

22.   In particular, the government contends that Microsoft decided to bundle the Internet Explorer, its Web browser software, with the Windows operating system to gain competitive advantage.

23.   Instead, it gives away its popular browser software, called Navigator, to increase its market share.

24.   It also includes e-mail and browser software to connect the Zaurus to the Internet, and multimedia programs to play digital music and video.

25.   It could, though, try to rein it in by tying the improvements developers wanted to its own operating system and Internet browser software.

26.   It asked a federal judge to order the Microsoft Corp. to stop forcing makers of personal computers to include its Internet browser software in every machine they sell.

27.   Its Navigator browser software is used by about three quarters of the computers linked to the global web of computer networks.

28.   Its Navigator was the runaway leader in the market for the browser software used to navigate the World Wide Web.

29.   Many analysts regard the browser software used for surfing the Internet to be a crucial gateway for computing in the future.

30.   MCI also will use Microsoft Internet Explorer browser software as part of its Internet products and market other Microsoft Internet products.